She probably has an upper respiratory infection called Kennel Cough which they catch from other dogs.
www.marvistavet.com/html/body_kennel_cough.html
If she seems really ill it might be the new canine flu
www.marvistavet.com/html/body_canine_influenza.html
It usually lasts 10-14 days but if she seems really ill lethargic not eating etc do see the vet for meds as either can go into pneumonia.
Hope this helps you!
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